They define this phrases as

---

There is Happiness behind every sadness.

Rainbow has also it's biblical mean,

the first rainbow appeared after the wideflood during Noah's time. God said that wideflood will not happen again. As a sign of that promise, God made the first rainbow.

Everytime Rainbow appears, this reminds the promise of God.

---

I screenshot the part of the bible verses where it wrote. 🙂 Genesis 9:11-16

This may explain further what i'm trying to say 🙂

---

Thanks for viewing.

Hope you like it ☺️

---